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Engineering Materials
0

Engineering Materials Practice Set-8

May 16, 2021

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25%

Page 1 of 4

1. Nimonic contains __________ percentage of nickel as that of Inconel.

More

Same

None of these

Less

2. Free cutting steels

Are used where ease in machining is the criterion

Do not exist

Contain carbon in free form

Require least cutting force

3. Chromium in steel

Gives ductility, toughness, tensile strength and anti-corrosion properties

Improves cutting ability and reduces hardenability

Improves wear resistance, cutting ability and toughness

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

4. Which of the following is the binding material in cemented carbides?

Nickel

Vanadium

Cobalt

Iron

5. Preheating is essential in welding

All nonferrous materials

All of the above

Cast iron

High speed steel

6. Cold rolled steel sheets contain carbon of the following order

0.4%

0.6%

0.1%

0.2%

7. Permalloy is a

Kind of stainless steel

Polymer

None ferrous alloy

Nickel and iron alloy having high permeability

8. Corrosion resistance of steel is increased by adding

Nickel and molybdenum

Aluminium and zinc

Chromium and nickel

Tungsten and sulphur

9. Compressive strength of grey cast iron in tonnes/cm is of the order of

1015

35

710

57

10. Sulphur in cast iron

Make the iron white and hard

Increases hardness and brittleness

Makes the iron soft and easily machinable

Aids fusibility and fluidity

Page 2 of 4

11. Hardness of upper bainite (acicular structure) is about

RC 48

RC 80

RC 65

RC 57

12. Tungsten in high speed steel provides

Hot hardness

Wear resistance

Toughness

Sharp cutting edge

13. Cupola produces following material

Cast iron

Malleable iron

Wrought iron

Pig iron

14. Gun metal contains

85 - 92% copper and rest tin with little lead and nickel

90% copper and 10% tin

70 - 78% copper and rest tin

70% copper and 30% zinc

15. Connecting rod is usually made of

Low carbon steel

Medium carbon steel

High carbon steel

Aluminium

16. Aluminium bronze contains aluminium and copper in the ratio of

50 : 50

60 : 40

10 : 90

40 : 60

17. Which of the following is used for bearing liner?

Babbitt metal

Gun metal

Bell metal

Bronze

18. An example of amorphous material is

Glass

Silver

Lead

Zinc

19. The machinability of steel is increased by

Sulphur, graphite and aluminium

Phosphorous and aluminium

Phosphorous, lead and sulphur

Silicon and sulphur

20. Drop forging dies contain carbon of the order of

0.25 to 0.5%

0.7 to 0.9%

0.1 to 0.2%

0.6 to 0.7%

Page 3 of 4

21. The crystal structure of brass is

B.C.C.

Orthorhombic crystalline structure

H.C.P.

F.C.C.

22. Phosphor bronze contains

1% phosphorous

None of the above

2.5% phosphorous

0.5% of phosphorous

23. Carbon in iron is an example of

Substitutional solution

Interstitial solid solution

All of the above

Intermetallic compounds

24. Perminvar alloy having constant permeability is an alloy of

Copper, nickel and antimony

Nickel, copper and zinc

Nickel, copper and iron

Iron, zinc and bismuth

25. Beryllium bronze has

(B) High fatigue limit

(D) None of these

(C) Both (A) and (B)

(A) High yield point

26. Bronze contains

70 - 75% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

27. Manganese in steel increases its

Hardness

Fluidity

Ductility

Tensile strength

28. The hardness of steel increases if it contains

Cementite

Pearlite

Martensite

Austenite

29. Delta metal is an alloy of

Iron, nickel and copper

Copper, zinc and iron

Iron, lead and tin

Iron, aluminium and magnesium

30. Steel made from phosphate iron is

Ductile

Brittle

Tough

Hard

Page 4 of 4

31. The alloy used for making electrical resistances and heating elements is

Magnin

Elinvar

Nichrome

Invar

32. The presence of sulphur in pig iron makes

It brittle

It easily machinable

It hard

The casting unsound

33. Which is false statement about tempering? Tempering is done to

Improve toughness

Improve ductility

Improve machinability

Release stresses

34. Shock resisting steels should have

Toughness

Low tensile strength

Low hardness

Low wear resistance

35. Weld decay is the phenomenon found with

Cast iron

Stainless steel

Mild steel

Nonferrous materials

36. The alloying element which reduces the formation of iron sulphide in steel is

Nickel

Vanadium

Chromium

Manganese

37. Argentite is the principal ore or raw material for

Zinc

Tin

Silver

Aluminium

38. High carbon steel carries carbon percentage

0.8 to 1.5%

0.6 to 0.8%

0.1 to 0.3%

0.3 to 0.6%

39. Melting point of iron is

1489°C

1601°C

1539°C

1712°C

40. The hardness is the property of a material due to which it

Can be drawn into wires

Breaks with little permanent distortion

Can cut another metal

Can be rolled or hammered into thin sheets

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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